Before you will place an order, you should answer a few question to make sure that you will buy the correct item for your car and that you need it in the first place.
Emulator will switch the AIRBAG/SRS light off only if it was caused by a faulty seat occupancy sensor. Here you can learn what are indicators of a faulty seat mat and what else can cause to light AIRBAG/SRS on.
On one car you will find it with no trouble at all, on others finding a seat occupancy sensor plug (seat mat plug) might be a challenge.
In regard to BMW and Mercedes, it is important to know to what market the car was dedicated - the EU or the US.
Check the models with 2-pin seat occupancy sensor plug installed.
Information about SRS in a nutshell
How to install the seat occupancy sensor and the seat belt emulators on a BMW in a few easy steps
Pictures and instructional video included!